CN108896807B - High-voltage bushing - Google Patents
High-voltage bushing Download PDFInfo
- Publication number
- CN108896807B CN108896807B CN201810558788.6A CN201810558788A CN108896807B CN 108896807 B CN108896807 B CN 108896807B CN 201810558788 A CN201810558788 A CN 201810558788A CN 108896807 B CN108896807 B CN 108896807B
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- Prior art keywords
- bushing
- thermistor
- module
- porcelain bushing
- metal guide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
Abstract
The invention provides a high-voltage bushing, which comprises a metal guide rod, an upper porcelain bushing, a lower porcelain bushing, a grounding flange and oil conservators, wherein the upper porcelain bushing and the lower porcelain bushing are wrapped outside the metal guide rod, the grounding flange is arranged between the upper porcelain bushing and the lower porcelain bushing, the oil conservators are arranged at two ends, far away from the grounding flange, of the upper porcelain bushing and the lower porcelain bushing, insulating oil and voltage-sharing capacitor polar plates are arranged in the upper porcelain bushing and the lower porcelain bushing, a plurality of measuring modules are arranged on the surface of the metal guide rod, and each measuring module comprises a fixed value resistor, a thermistor, a copper foil outer skin and a lead.
Description
Technical Field
The invention relates to the field of intelligent power grid equipment, in particular to a high-voltage bushing.
Background
With the increase of voltage class, the internal insulation of the high-voltage bushing becomes a great difficulty for the safe and stable operation of the power grid. The highest failure rate of common high-voltage bushing products in experiments and operation is the internal insulation failure. Causes of insulation faults in high voltage bushings include: latent defects are left during manufacturing, transportation and maintenance; or the defects are gradually generated under the action of electric field and conductor heating, mechanical damage and chemical corrosion and the influence of atmospheric conditions in the long-term operation process.
The online monitoring of the sleeve fault on the power grid safety refers to the real-time detection of the running state of a device, including signal transmission, signal processing and acquisition, signal transmission, data processing, fault diagnosis and the like, and in consideration of the actual conditions of enterprise safety production, personnel safety and instrument and equipment, the online monitoring, the advance prediction of the running state of equipment, the reference of historical running records and the evaluation and maintenance of the running state of the equipment are necessary.
Disclosure of Invention
In view of the above, there is a need for a high voltage bushing capable of monitoring the internal current and temperature information of the high voltage bushing in real time, facilitating problem finding and troubleshooting.
The invention provides a high-voltage bushing which comprises a metal guide rod, an upper porcelain bushing and a lower porcelain bushing sleeved outside the metal guide rod, a grounding flange arranged between the upper porcelain bushing and the lower porcelain bushing, and conservator assemblies arranged at two ends, far away from the grounding flange, of the upper porcelain bushing and the lower porcelain bushing, wherein insulating oil and a voltage-sharing capacitor polar plate are arranged in the upper porcelain bushing and the lower porcelain bushing, and at least one measuring module is arranged on the surface of the metal guide rod.
Furthermore, each measuring module comprises a fixed value resistor, a thermistor and a copper foil sheath, and the metal guide rod, the fixed value resistor, the thermistor and the copper foil sheath are connected in series.
Furthermore, the copper foil sheath is cylindrically wrapped on the outer sides of the fixed value resistor and the thermistor, and inner buckles are arranged on two sides of the copper foil sheath.
Furthermore, the fixed value resistor and the thermistor are spirally distributed on the outer side of the metal guide rod.
Furthermore, the conservator assembly comprises a processing module, a power supply module, a communication module and two conservators, wherein the processing module, the power supply module and the communication module are all arranged in one of the conservators, the power supply module is respectively connected with the processing module and the communication module, and the processing module is connected with the communication module.
Furthermore, the measuring module further comprises a wire, the wire is provided with an insulating skin, and each of the fixed value resistor and the thermistor is connected with one wire and is connected with the processing module through the wire.
Furthermore, the power module is a CT energy taking device and is matched with a rechargeable power supply.
And further, the measuring module is far away from one end of the oil conservator provided with the module, an insulating gasket is arranged between the copper foil sheath and the metal guide rod, and the insulating gasket is used for ensuring the support and insulation between the copper foil sheath and the metal guide rod.
Further, the constant value resistor is a kiloohm resistor.
Furthermore, one side of the oil conservator, which is far away from the grounding flange, is provided with an opening for wireless signal transmission.
The high-voltage bushing can monitor the current and temperature information in the bushing in real time, can know the distribution condition of the bushing in the position, has higher relevance to faults, improves the measurement data quantity of online monitoring, can better master the running state of the high-voltage bushing, is favorable for finding problems in time, effectively guides the running and maintenance, and improves the safety of the high-voltage bushing.
Drawings
Fig. 1 is a schematic structural diagram of a high voltage bushing according to an embodiment of the present invention.
Figure 2 is an enlarged view of a part of the high voltage bushing shown in figure 1.
Fig. 3 is an enlarged schematic view of the high voltage bushing of fig. 1 at the conservator assembly.
FIG. 4 is a top view of a measurement module in accordance with an embodiment of the present invention.
FIG. 5 is a cross-sectional view of the measurement module of FIG. 3 of the present invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, fig. 1 and 2 are schematic structural diagrams of a high voltage bushing 100 according to an embodiment of the present invention, where the high voltage bushing 100 includes a metal guide rod 10, a measurement module 20, a porcelain bushing 30, a grounding flange 40, an oil conservator assembly 50, insulating oil 60, and a voltage-sharing capacitor plate 70. The high voltage bushing 100 is provided with at least one of the measurement modules 20, the more detailed the distribution of the internal current of the high voltage bushing 100 is measured.
The measuring module 20 is arranged on the outer side of the metal guide rod 10, the porcelain bushing 30 is sleeved on the outer sides of the metal guide rod 10 and the measuring module 20, the porcelain bushing 30 comprises an upper porcelain bushing 31 and a lower porcelain bushing 32, the grounding flange 40 is arranged between the upper porcelain bushing 31 and the lower porcelain bushing 32, the conservator components 50 are respectively arranged at two ends of the porcelain bushing 30 far away from the grounding flange 40, and the insulating oil 60 and the voltage-sharing capacitor plate 70 are both arranged in the porcelain bushing 30.
As shown in fig. 3, 4 and 5, each of the measuring modules 20 includes a fixed resistor 21, a thermistor 22, a copper foil sheath 23 and a conducting wire 24, each of the fixed resistor 21 and the thermistor 22 is connected to the conducting wire 24, and the conducting wire 24 is provided with an insulating sheath.
In this embodiment, the metal guide rod 10, the fixed resistor 21, the thermistor 22 and the copper foil sheath 23 are connected in series, specifically, the fixed resistor 21 and the thermistor 22 are installed outside the metal guide rod 10, the copper foil sheath 23 covers the fixed resistor 21 and the thermistor 22, in order to ensure the current distribution and the consistency of the traditional bushing and the overall insulation performance, the copper foil sheath 23 is cylindrically covered outside the fixed resistor 21 and the thermistor 22, in order to prevent the partial discharge at both sides of the copper foil sheath 23, inner buckles 231 are further arranged at both sides of the copper foil sheath 23, the fixed resistor 21 and the thermistor 22 are spirally arranged outside the metal guide rod 10, the spiral arrangement is convenient for orderly combing the wires 24, the wires 24 are located between the metal guide rod 10 and the copper foil sheath 23, and the space between the metal guide rod 10 and the copper foil outer skin 23 is supported and insulated.
The internal current of the high voltage bushing 100 flows from the metal guide rod 10, sequentially through the fixed resistor 21 and the thermistor 22, reaches the copper foil sheath 23, and then flows into the insulating oil 60.
In this embodiment, the fixed resistor 21 and the thermistor 22 are specially made resistors, the influence of temperature on the resistance of the fixed resistor 21 is small, the resistance of the fixed resistor 21 is in the kiloohm level, and since the resistance of the fixed resistor 21 is far smaller than the resistance of the insulating oil 60, the introduction of the measuring module 20 does not influence the size and distribution of the internal current.
The conservator assembly 50 includes two conservators 51, a processing module 52, a power module 53, and a communication module 54. The processing module 52, the power module 53 and the communication module 54 are all disposed in one of the conservators 51, the power module 53 is respectively connected to the processing module 52 and the communication module 54, the processing module 52 is connected to the communication module 54, and in order to ensure that the transmission information of the communication module 54 is not shielded, an opening for wireless signal transmission is disposed on one side of the conservator 51 away from the grounding flange 40.
It can be understood that since the wires 24 are sparsely arranged at the end of the conservator 51 far from the module, an insulating spacer can be arranged between the copper foil outer skin 23 and the metal guide rod 10 of the measuring module 20 far from the end of the conservator 51, and the insulating spacer is also used for ensuring the support and insulation between the copper foil outer skin 23 and the metal guide rod 10.
The processing module 52 is configured to process the information monitored by the measuring module 20, and send the information to an external receiving end through the communication module 54. In this embodiment, the processing module 52 is preferably a single chip microcomputer, and in other embodiments, the processing module 52 may be a PLC, an AMR, or the like.
The power module 53 is used for supplying power to the processing module 52 and the power module 53 to ensure the normal operation of the two. In this embodiment, the power module 53 is a CT energy obtaining device, the CT energy obtaining device obtains electric energy by sensing surrounding electromagnetic energy, but cannot obtain electric energy when the network is disconnected, and the CT energy obtaining device is further provided with a rechargeable power supply to ensure that a monitoring signal can still be sent within a period of time when the network is disconnected.
The communication module 54 is configured to send the monitored information to an external receiving end, the communication module 54 preferably employs a bluetooth technology, and may also be a wireless local area network technology, a 433 mhz frequency band wireless communication technology, a zigbee protocol-based wireless communication technology, and the like, and the receiving end may be a mobile phone, a notebook computer, a desktop computer, or another intelligent terminal.
As shown in fig. 3, the fixed resistor 21 and the thermistor 22 are respectively connected to one of the wires 24 (only one wire is shown in the figure), and the other end of the wire 24 is connected to the processing module 52.
Specifically, the conducting wire 24 connected to the fixed resistor 21 transmits the terminal voltage U1 of the fixed resistor 21, the ratio of the U1 to the resistance R of the fixed resistor 21 is the local current value I, and the other conducting wire 24 connected to the thermistor 22 transmits the terminal voltage U2 of the thermistor 22, so that the voltage borne by the thermistor 22 is (U2-U1), (U2-U1) and the ratio of I is the resistance of the thermistor 22, that is, the local temperature is reflected.
In this embodiment, the high voltage bushing 100 monitors the distribution of the current and the temperature in the bushing through the fixed value resistor 21 and the thermistor 22 in the measurement module 20, and the single chip sends the monitoring result to the external receiving terminal in the form of bluetooth, so as to realize real-time monitoring of the distribution of the temperature and the current in the high voltage bushing 100, and meanwhile, the CT energy obtaining device obtains continuous electric energy to supply power to the single chip and the bluetooth module, thereby ensuring long-time operation.
The high-voltage bushing can monitor the current and temperature information in the bushing in real time, send monitoring signals to the external receiving end, know the distribution condition of the bushing in position, has higher relevance to faults, improves the measured data quantity of on-line monitoring, can better master the running state of the high-voltage bushing, is favorable for finding problems in time, effectively guides running maintenance and improves the safety of the high-voltage bushing.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. A high voltage bushing, characterized by: the device comprises a metal guide rod, an upper porcelain bushing and a lower porcelain bushing which are sleeved on the outer side of the metal guide rod, a grounding flange arranged between the upper porcelain bushing and the lower porcelain bushing, and conservator components arranged at two ends of the upper porcelain bushing and the lower porcelain bushing, which are far away from the grounding flange, wherein insulating oil and voltage-sharing capacitor polar plates are arranged in the upper porcelain bushing and the lower porcelain bushing, a plurality of measuring modules are arranged on the surface of the metal guide rod, each measuring module comprises a fixed value resistor, a thermistor and a copper foil sheath, the metal guide rod, the fixed value resistor, the thermistor and the copper foil sheath are connected in series, the fixed value resistor and the thermistor are spirally distributed on the outer side of the metal guide rod, the fixed value resistor is a kiloohm level resistor, each fixed value resistor and thermistor is connected with a lead, and is connected with the conservator components through the leads, the lead connected with the fixed value resistor transmits the tail end voltage U1 of the fixed value resistor, the ratio of the U1 to the resistance value of the fixed value resistor is a local current value I, the other lead connected with the thermistor transmits the tail end voltage U2 of the thermistor, the voltage borne by the thermistor is U2-U1, the ratio of the voltage borne by the thermistor U2-U1 to the I is the resistance value of the thermistor, local temperature is reflected, and the temperature is sent to an external receiving end through the conservator assembly.
2. The high voltage bushing as claimed in claim 1, wherein: the copper foil sheath is coated on the outer sides of the fixed value resistor and the thermistor in a cylindrical mode, and inner buckles are arranged on two sides of the copper foil sheath.
3. The high voltage bushing as claimed in claim 1, wherein: the oil conservator assembly comprises a processing module, a power supply module, a communication module and two oil conservators, wherein the processing module, the power supply module and the communication module are all arranged in one of the oil conservators, the power supply module is respectively connected with the processing module and the communication module, and the processing module is connected with the communication module.
4. A high voltage bushing as claimed in claim 3, wherein: the wire is provided with an insulating skin, and each fixed value resistor and each thermistor are connected with the processing module through the wire.
5. A high voltage bushing as claimed in claim 3, wherein: the power module is a CT energy taking device and is matched with a rechargeable power supply.
6. A high voltage bushing as claimed in claim 3, wherein: keep away from be provided with the conservator one end of module the measurement module be equipped with insulating gasket between copper foil crust and the metal guide arm, insulating gasket is used for guaranteeing to support and insulating between copper foil crust and the metal guide arm, the wire is located between metal guide arm and the copper foil crust.
7. A high voltage bushing as claimed in claim 3, wherein: and an opening for wireless signal transmission is formed in one side, far away from the grounding flange, of the oil conservator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558788.6A CN108896807B (en) | 2018-06-01 | 2018-06-01 | High-voltage bushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558788.6A CN108896807B (en) | 2018-06-01 | 2018-06-01 | High-voltage bushing |
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| CN108896807A CN108896807A (en) | 2018-11-27 |
| CN108896807B true CN108896807B (en) | 2021-08-03 |
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| CN201810558788.6A Active CN108896807B (en) | 2018-06-01 | 2018-06-01 | High-voltage bushing |
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| CN201237533Y (en) * | 2008-07-08 | 2009-05-13 | 周骁威 | On-line temperature measurement device for cable joint of high-voltage plant |
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2018
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